Biography
Bashir Ahmmad ARIMA
Yamagata University, Japan
Sonication-assisted fabrication of metal doped BiFeO3 nanoparticles and investigation of their magnetic properties
Abstract:
We
present a simple technique to fabricate multiferroic nanoparticlesfrom the bulk
powder materialsby using ultrasonic energy. The bulk ceramic samples, with
nominal composition of Bi0.9Gd0.1Fe1–xTixO3and
Bi0.7Ba0.3Fe1-xTixO3 (x=0.00-0.25), were synthesized initially by conventional solid state reaction technique.
Then, the nanoparticles of the samples were prepared by ultrasonic
fragmentation of the bulk power. The particles size of Bi0.9Gd0.1Fe1–xTixO3 was studied as a function of sonication time with TEM imaging and electron
diffraction. These confirmed the formation of a large fraction of
single-crystalline nanoparticles with a mean size of 12 nm. The synthesized
nanoparticles exhibited a significantly improved magnetic behavior compared to
their bulk counterparts at room temperature.Also, a large difference between the
magnetic properties of nanoparticle and bulk powderwas observed forBi0.7Ba0.3Fe1-xTixO3 sample. The X-ray diffraction patterns demonstrated the presence of significant
number of impurity phases in the bulk materials. Interestingly, these secondary
phases were removed due to sonication of the bulk powder materials for 60 min.Moreover,
X-ray photoelectron spectroscopy showed reduced oxygen vacancies in the
nanoparticles compared to the bulk sample. Reduced oxygen vacancies resulted
reduced leakage current and improved ferroelectric properties. We believe that
the observe improvement of samples purity via the ultrasonic method may be
promising to fabricated a wide range of functional nanomaterials.
Biography:
Bashir AhmmadArima has completed his PhD from Kagoshima University, Japan. Currently, he is an assistant professor at the Graduate School of Science and Engineering, Yamagata University, Japan. Prior to joining the current institution, he was an assistance professor and researcher at Okayama University and Kyushu University, respectively. He is a recipient of Japanese government scholarship and also JSPS postdoctoral fellowship in Japan. His research interests include nanophotocatalysis, solar-hydrogen,solar cells and magnetic materials. He has published more than 60technical papers in reputed journals and 2 book chapters.He had been the guest editor of the International Journal of Photoenergy in 2014. Presently, he is serving as editorial board member of American Research Journal of Electrical Engineering, International Institute of Engineers and technical committee member of Component Parts and Materials (CPM) ofthe IEICE societyin Japan.